No, they're not big issues. The point is you're constantly in the dealer for them. Some people don't like making time out of their schedule for unexpected service.
And you're very uniformed if you think they can just "clean house". The automotive technician industry is losing on average 50k people a year as the older generation retire and fresh blood is looking elsewhere. A lot of the labor time for 4XE (and other phev repairs) is god awful, and it's no surprise techs want to avoid those jobs. Good techs are literally un-fireable. You can't replace them. I've got one transmission guy at my shop whose 3+ months backlogged and no matter how hard they look they can't find a second guy to hire to help reduce the work load. I don't touch that work because it pays like ass under warranty and isn't worth the time to bother learning it. Certified techs who know what they're doing are a rare bunch. It isn't as simple as you make it out to be.
It sounds like the best bet is stop buying from legacy manufacturers like Jeep, in my experience and based on this forum Jeep dealership techs have issues doing basic work on any vehicle, even a basic 3.6 Pentastar Wrangler.